pic: Too much power?

[asid61]

I think 3/16" is fine. The one problem our gearbox didn't have this year was bending (and yes, I checked it with a square post-season) although we did not pocket it at all.
However, you might want to look at that sprocket. Depending on what this is used for, it might a good idea to switch to #35 chain, especially if this is ever used for a crab drive or something similar with one drive chain.
I think this is a little overkill, but JMO.

Keep in mind 971 used a 4-cim drive this year. 8 motors is considerably more power and weight.